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Northern Prairie Star Party Black Nugget Lake September 15, 2012 . Brian Martin The King’s University College. Three Fundamental “Sciences”. Measuring “Distance”, Position & “Scale”  Astrometry Measuring Brightness and Intensity  Photometry Measuring “Colour”  Spectroscopy.

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Northern Prairie Star Party

Black Nugget Lake

September 15, 2012

Brian Martin

The King’s University College


Three fundamental sciences
Three Fundamental “Sciences”

  • Measuring “Distance”, Position & “Scale”  Astrometry

  • Measuring Brightness and Intensity  Photometry

  • Measuring “Colour”  Spectroscopy

Exciting science that you can do from the back yard!


Astrometry
Astrometry

August 29, 2012

H-alpha filter

0.001 s exposure

ED80

Atik 314L+ camera

TKUCO

How big are the lunar features in this image?


Some math
Some Math …

S

R

q

  • The Small Angle Formula Rq* = S where:

    • R = distance from object

    • q = angle that the object subtends in the sky

    • S = distance across the object

* Angle in radians


The scale of your telescope
The Scale of Your Telescope

  • Scale in (seconds of arc)/mm found by:

  • In the previous image a ED80 telescope was used so the scale is (206265)/(600 mm) = 343.8 “/mm

  • The Atik 314L+ has 6.45 mm pixels, so each pixel has a scale of 342.8”/mm × 0.00645mm/px = 2.22 “/px when used with the ED80

  • By measuring the number of pixels you can measure the angle that an object or feature subtends


304 px = 1236 km

850 px = 3457 km

(0.5% error)


Some other images
Some other images…

  • Capuanus Crater:

    • December 26,2009

    • C14, f/11

    • Imaging source DMK2104

    • 2000 frames

    • Scale = 0.20”/px

    • Distance = 0.002523 AU


  • Apennines (Eratsothenes, Archimedes)

    • March 1, 2012

    • C14, f/7

    • Atik 314L+

    • 20 frames (0.005 s)

    • Scale = 0.52”/px

    • Distance = 0.00262 AU


  • Jupiter

    • November 5, 2011

    • C14, f/11

    • Imaging Source DMK2104

    • LRGB (~2000 frames each)

    • Scale = 0.26”/px


  • M57

    • August 26, 2011

    • C14 f/7

    • ST7E

    • LRGB

    • Scale 1.49”/px

    • Distance = 2300 ly


  • M15

    • August 21, 2011

    • C14 f/7

    • ST7E

    • LRGB

    • Scale 1.49”/px

    • Distance = 33 Kly


Photometry measuring changes in brightness
Photometry – Measuring Changes in Brightness

  • Intrinsic Variables

    • dScuti

    • SX Phe

  • Novae and Supernovae

  • Cataclysmic Variables


Consumer grade ccd cameras

Capable of doing excellent science!

Modest cost (< $2000)

Excellent software support

Monochrome with no anti-blooming is preferred

Pixel size should be carefully matched to image scale – need to oversample

Capable of milli-magnitude precision photometry

Consumer grade CCD cameras…

Atik 314L+

SBIG ST7E


Sx phoenicis variables
SX Phoenicis Variables

  • BL Camelopardalis

    • Average mag 13.1

    • Period

      • 0.0389d

      • 56 minutes – this is an exciting system to watch!!

40 s integration, C14 f/7

ST7E camera – KAF400 detector


The light curve
The Light-Curve…

November 9, 2009

BL Cam

Teff 7730 K

Age ~4Ga

Metal poor

Period shows a

Small change over time!

November 9, 2009, s (C2-C1) = 0.007 mag


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